DJAUHARI, Maman. Geometric Interpretation of Vector Variance. MATEMATIKA, [S. l.], v. 27, p. 51–57, 2011. DOI: 10.11113/matematika.v27.n.296. Disponível em: https://matematika.utm.my/index.php/matematika/article/view/296. Acesso em: 16 jul. 2025.